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Fair Value Measurements
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
FASB ASC Topic 820 establishes a fair value hierarchy for the inputs to valuation techniques used to measure assets and liabilities at fair value using the following three categories (from highest to lowest priority):

•Level 1 – Inputs that represent quoted prices for identical instruments in active markets.
•Level 2 – Inputs that represent quoted prices for similar instruments in active markets or quoted prices for identical instruments in non-active markets. Also includes valuation techniques whose inputs are derived principally from observable market data other than quoted prices, such as interest rates or other market-corroborated means.
•Level 3 – Inputs that are largely unobservable, as little or no market data exists for the instrument being valued.
All assets and liabilities measured at fair value on both a recurring and nonrecurring basis have been categorized into the above three levels. The following tables present assets and liabilities measured at fair value on a recurring basis and reported on the consolidated balance sheets:
 June 30, 2024
 Level 1Level 2Level 3Total
 (dollars in thousands)
Loans held for sale$— $26,822 $— $26,822 
Available for sale investment securities:
State and municipal securities— 820,109 — 820,109 
Corporate debt securities— 337,398 — 337,398 
Collateralized mortgage obligations— 713,769 — 713,769 
Residential mortgage-backed securities— 557,191 — 557,191 
Commercial mortgage-backed securities— 511,127 — 511,127 
Total available for sale investment securities— 2,939,594 — 2,939,594 
Other assets:
Investments held in Rabbi Trust34,339 — — 34,339 
Derivative assets766 175,762 — 176,528 
Total assets$35,105 $3,142,178 $— $3,177,283 
Other liabilities:
Deferred compensation liabilities$34,339 $— $— $34,339 
Derivative liabilities548 280,130 — 280,678 
Total liabilities$34,887 $280,130 $— $315,017 

 December 31, 2023
 Level 1Level 2Level 3Total
 (dollars in thousands)
Loans held for sale$— $15,158 $— $15,158 
Available for sale investment securities:
U.S. Government securities42,161 — — 42,161 
U.S. Government sponsored agency securities— 1,010 — 1,010 
State and municipal securities— 1,072,013 — 1,072,013 
Corporate debt securities— 440,551 — 440,551 
Collateralized mortgage obligations— 111,434 — 111,434 
Residential mortgage-backed securities— 196,795 — 196,795 
Commercial mortgage-backed securities— 534,388 — 534,388 
Total available for sale investment securities42,161 2,356,191 — 2,398,352 
Other assets:
Investments held in Rabbi Trust29,819 — — 29,819 
Derivative assets572 157,540 — 158,112 
Total assets$72,552 $2,528,889 $— $2,601,441 
Other liabilities:
Deferred compensation liabilities$29,819 $— $— $29,819 
Derivative liabilities477 246,157 — 246,634 
Total liabilities$30,296 $246,157 $— $276,453 
The valuation techniques used to measure fair value for the items in the preceding tables are as follows:

Loans held for sale – This category includes mortgage loans held for sale that are measured at fair value. Fair values as of June 30, 2024 and December 31, 2023 were measured at the price that secondary market investors were offering for loans with similar characteristics.

Available for sale investment securities – Included in this asset category are debt securities. Level 2 investment securities are valued by a third-party pricing service. The pricing service uses pricing models that vary based on asset class and incorporate available market information, including quoted prices of investment securities with similar characteristics. Because many fixed income securities do not trade on a daily basis, pricing models use available information, as applicable, through processes such as benchmark yield curves, benchmarking of like securities, sector groupings and matrix pricing.

Standard market inputs include: benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data, including market research publications. For certain security types, additional inputs may be used or some of the standard market inputs may not be applicable.

•U.S. Government securities – These securities are classified as Level 1. Fair values are based on quoted prices with active markets.

•U.S. Government-sponsored agency securities, State and municipal securities/Collateralized mortgage obligations/Residential mortgage-backed securities/Commercial mortgage-backed securities – These debt securities are classified as Level 2. Fair values are determined by a third-party pricing service, as detailed above.

•Corporate debt securities – These securities are classified as Level 2. This category consists of subordinated debt and senior debt issued by financial institutions ($330.4 million at June 30, 2024 and $433.4 million at December 31, 2023) and other corporate debt issued by non-financial institutions ($6.9 million and $7.2 million at June 30, 2024 and December 31, 2023, respectively). The fair values for these corporate debt securities are determined by a third-party pricing service as detailed above.

Investments held in Rabbi Trust – This category consists of mutual funds that are held in trust for employee deferred compensation plans that the Corporation has elected to measure at fair value. Shares of mutual funds are valued based on net asset value, which represent quoted market prices for the underlying shares held in the mutual funds, and as such, are classified as Level 1.

Derivative assets – Fair value of foreign currency exchange contracts are classified as Level 1 assets ($0.8 million and $0.6 million at June 30, 2024 and December 31, 2023, respectively). The mutual funds and foreign exchange prices used to measure these items at fair value are based on quoted prices for identical instruments in active markets.

Level 2 assets, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($1.0 million at June 30, 2024 and $0.5 million at December 31, 2023) and the fair value of interest rate derivatives ($174.8 million at June 30, 2024 and $157.1 million at December 31, 2023). The fair values of the interest rate locks, forward commitments and interest rate derivatives represent the amounts that would be required to settle the derivative financial instruments at the balance sheet date. See "Note 7 - Derivative Financial Instruments," for additional information.

Deferred compensation liabilities – Fair value of amounts due to employees under deferred compensation plans, classified as Level 1 liabilities and are included in other liabilities on the consolidated balance sheets. The fair values of these liabilities are determined in the same manner as the related assets, as described under the heading "Investments held in Rabbi Trust" above.

Derivative liabilities – Level 1 liabilities, representing the fair value of foreign currency exchange contracts ($0.5 million at June 30, 2024 and December 31, 2023).

Level 2 liabilities, representing the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors ($0.2 million at June 30, 2024 and $0.9 million at December 31, 2023) and the fair value of interest rate derivatives ($279.9 million at June 30, 2024 and $245.6 million at December 31, 2023).

The fair values of these liabilities are determined in the same manner as the related assets as described under the heading "Derivative assets" above.
Certain financial instruments are not measured at fair value on an ongoing basis but are subject to fair value measurement in certain circumstances, such as upon their acquisition or when there is evidence of impairment. The following table presents Level 3 financial assets measured at fair value on a nonrecurring basis:
 June 30,
2024		December 31,
2023
 (dollars in thousands)
Loans, net$121,942 $102,135 
OREO1,444 896 
MSRs(1)
51,724 49,696 
Total assets$175,110 $152,727 
(1) Amounts shown are estimated fair value. MSRs are recorded on the Corporation's consolidated balance sheets at the lower of amortized cost or fair value.
See "Note 6 - Mortgage Servicing Rights" for additional information.

The valuation techniques used to measure fair value for the items in the table above are as follows:

•Loans, net – This category consists of loans that were individually evaluated for impairment and have been classified as Level 3 assets. The amount shown is the balance of non-accrual loans, net of related ACL. See "Note 5 - Loans and Allowance for Credit Losses," for additional details.

•OREO – This category consists of OREO classified as Level 3 assets, for which the fair values were based on estimated selling prices less estimated selling costs for similar assets in active markets.

•MSRs – This category consists of MSRs, which were initially recorded at fair value upon the sale of residential mortgage loans to secondary market investors, and subsequently carried at the lower of amortized cost or fair value. MSRs are amortized as a reduction to servicing income over the estimated lives of the underlying loans. MSRs are stratified by product type and evaluated for impairment by comparing each stratum's carrying amount to its estimated fair value. Fair values are determined at the end of each quarter through a discounted cash flows valuation performed by a third-party valuation expert. Significant inputs to the valuation included expected net servicing income, the discount rate and the expected life of the underlying loans. Expected life is based on the contractual terms of the loans as adjusted for prepayment projections. The weighted average annual constant prepayment rate and the weighted average discount rate used in the June 30, 2024 valuation were 7.3% and 9.5%, respectively. Management reviews the reasonableness of the significant inputs to the third-party valuation in comparison to market data. See "Note 6 - Mortgage Servicing Rights," for additional information.
The following tables detail the book values and the estimated fair values of the Corporation's financial instruments:
 June 30, 2024
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(dollars in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$1,396,282 $1,396,282 $— $— $1,396,282 
FRB and FHLB stock125,297 — 125,297 — 125,297 
Loans held for sale 26,822 — 26,822 — 26,822 
AFS securities 2,939,594 — 2,939,594 — 2,939,594 
HTM securities1,244,433 — 1,033,439 — 1,033,439 
Loans, net23,730,356 — — 22,391,497 22,391,497 
Accrued interest receivable120,752 120,752 — — 120,752 
Other assets 731,849 524,312 175,762 53,168 753,242 
FINANCIAL LIABILITIES  
Demand and savings deposits$20,650,955 $20,650,955 $— $— $20,650,955 
Brokered deposits995,975 139,166 856,809 — 995,975 
Time deposits3,912,724 — 3,912,608 — 3,912,608 
Accrued interest payable48,757 48,757 — — 48,757 
Federal Home Loan Bank advances750,000 754,414 — — 754,414 
Senior debt and subordinated debt535,741 — 419,072 — 419,072 
Other borrowings892,856 891,851 1,119 — 892,970 
Other liabilities 467,810 173,140 280,130 14,540 467,810 

December 31, 2023
Estimated Fair Value
Carrying AmountLevel 1Level 2Level 3Total
(dollars in thousands)
FINANCIAL ASSETS
Cash and cash equivalents$549,710 $549,710 $— $— $549,710 
FRB and FHLB stock124,405 — 124,405 — 124,405 
Loans held for sale15,158 — 15,158 — 15,158 
AFS securities2,398,352 42,161 2,356,191 — 2,398,352 
HTM securities1,267,922 — 1,072,207 — 1,072,207 
Loans, net21,057,690 — — 19,930,560 19,930,560 
Accrued interest receivable107,972 107,972 — — 107,972 
Other assets661,067 452,935 157,540 50,592 661,067 
FINANCIAL LIABILITIES
Demand and savings deposits$17,653,690 $17,653,690 $— $— $17,653,690 
Brokered deposits1,144,692 145,987 999,392 — 1,145,379 
Time deposits2,739,241 — 2,714,709 — 2,714,709 
Accrued interest payable35,083 35,083 — — 35,083 
Federal funds purchased240,000 240,000 — — 240,000 
Federal Home Loan Bank advances1,100,000 1,094,013 — — 1,094,013 
Senior debt and subordinated debt535,384 — 463,270 — 463,270 
Other borrowings612,142 611,269 837 — 612,106 
Other liabilities429,046 165,635 246,157 17,254 429,046 

Fair values of financial instruments are significantly affected by the assumptions used, principally the timing of future cash flows and discount rates. Because assumptions are inherently subjective in nature, the estimated fair values cannot be
substantiated by comparison to independent market quotes and, in many cases, the estimated fair values could not necessarily be realized in an immediate sale or settlement of the instrument. The aggregate fair value amounts presented do not necessarily represent management’s estimate of the underlying value of the Corporation.

For short-term financial instruments, defined as those with remaining maturities of 90 days or less, and excluding those recorded at fair value on the Corporation's consolidated balance sheets, book value was considered to be a reasonable estimate of fair value.

The following instruments are predominantly short-term:
Assets  Liabilities
Cash and cash equivalents  Demand and savings deposits
Accrued interest receivable  Other borrowings
  Accrued interest payable

FRB and FHLB stock represent restricted investments and are carried at cost on the consolidated balance sheets, which is a reasonable estimate of fair value.

As of June 30, 2024, fair values for loans and time deposits were estimated by discounting future cash flows using the current rates, as adjusted for liquidity considerations, at which similar loans would be made to borrowers and similar deposits would be issued to customers for the same remaining maturities. Fair values of loans also include estimated credit losses that would be assumed in a market transaction, which represents estimated exit prices.

Brokered deposits consist of demand and saving deposits, which are classified as Level 1, and time deposits, which are classified as Level 2. The fair value of these deposits is determined in a manner consistent with the respective type of deposits discussed above.